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Ethical approval was obtained from the Rene Rachou Institute ethics committee under protocol CAAE 49209515.0.0000.50.91. the homeless population gave signed consent for participation in the study as a whole, including the interviews. Information about the study, potential harms and benefits, the purpose of the study and the right to withdraw were emphasized, both in the written material and directly to the homeless population before the interviews started. Anonymity and confidentiality on the audio-recordings and the transcripts were secured by using subject identifier codes instead of names.

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Not applicable.

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The authors declare that they have no competing interests.

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